Decide How to Download iPadOS 13.3.1
Decide how you'll download and install the iPadOS 13.3.1 update on your device before you tap download and install.
If you plan on installing iPadOS 13.3.1 Over-the-Air (OTA) through your Settings, you'll need to have at least a 50% charge and your iPad will need to be connected to a Wi-Fi network.
You can also install iPadOS 13.3.1 via iTunes (if you're running macOS Mojave or below) or Finder (if you're running macOS Catalina). Simply plug your device in, find your device, and check for an update.
Figure this out ahead of time.